Method/Apparatus/Procedure: Binary mixtures containing 50 ml tetrachloromethane were isopiestically equilibrated with water in an equilibration vessel which was submerged in a waterbath. The equilibrium concentration of water in the binary mixtures was then determined by a Karl Fischer titration method. The apparatus included a Zeromatic II potentiometer with the dead-stop end-point indication. The determinations were made at least in duplicate.